Remove/install cylinder head cover

AR01.20-P-5014OLD

Remove/install cylinder head cover

19.08.2019

Engine

651 in model 205, 253

Modification notes

19.08.2019

Note added.

Operation step 8

Shown on engine 651.911

1

Vent hose for crankcase ventilation system

4

Banjo bolt

2

Cylinder head cover

B6/1

Camshaft Hall sensor

3

Bolts

3

Screw

6

Groove

5

Seal

 

Remove/install

1

Remove engine cover.

 Installation: Ensure correct seating of the engine cover.

2

Remove engine air intake duct upstream of air filter.

3

Detach bleed hose for the crankcase ventilation system (1) to cylinder head cover (2).

4

Remove fuel injectors.

AR07.16-P-1000OLD

5

Unclip vacuum line for vacuum pump on engine wiring harness.

6

Remove engine wiring harness for removal of cylinder head cover (2) and place to one side.

Engine 651 in model 205

AR15.18-P-1000-03OLD

Engine 651 in model 253

AR01.00-P-2410-04RF

7

Remove banjo bolt (4), remove return hose on rail and close off openings with suitable grommets.

 Installation: Install new sealing rings.

 Banjo bolt, return line to rail

*BA07.16-P-1004-01H

 Record plug

*129589009100

8

Unscrew screws (3) and take off cylinder head cover (2).

General information on checking camshafts and bearing points of camshafts

AH05.20-P-1000-09SZ

 Installation: Replace seal (5) on cylinder head cover (2). Push seal (5) over the collar of the respective screw/bolts (3) and press into the slot (6) around the whole circumference.

 Screw/bolt, cylinder head cover to cylinder head

*BA01.20-P-1001-01Q

9

Remove camshaft Hall sensor (B6/1).

When replacing cylinder head cover (2).

AR15.10-P-2000OLD

10

Install in the reverse order.

 Warning

Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.

Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

11

Check leaktightness of fuel system and cylinder head cover (2) when engine is running.

 Crankcase ventilation, cylinder head cover

Number

Designation

Engine 651

BA01.20-P-1001-01Q

Screw/bolt, cylinder head cover to cylinder head

Nm

9

 Common rail diesel injection (CDI)

Number

Designation

Engine 651

BA07.16-P-1004-01H

Banjo bolt, return line to rail

Nm

25